#define k_SCREEN_WIDTH				480
#define k_SCREEN_HEIGHT				320
#define k_DEVICE_WIDTH				480
#define k_DEVICE_HEIGHT				320

#define ORIENTATION_INVALID				(-1)
#define ORIENTATION_PORTRAIT			(1 << 0)
#define ORIENTATION_LANDSCAPE_90		(1 << 1)
#define ORIENTATION_LANDSCAPE_270		(1 << 2)

#define ORIENTATION_DEFAULT				ORIENTATION_PORTRAIT